Grimsby's Trusted Spray Foam Insulation Contractors

What Is Spray Foam Insulation?

Spray foam insulation is a polyurethane-based product applied as a liquid that expands rapidly on contact, filling every crack, gap, and cavity in your walls, ceilings, or floors. Unlike traditional fiberglass batts that are cut to fit and leave gaps around wiring, plumbing, and framing, spray foam creates a seamless, monolithic barrier that stops air movement completely.

There are two main types: open-cell (half-pound) foam at roughly R-3.7 per inch, and closed-cell (two-pound) foam at R-6 to R-7 per inch. Both provide superior air sealing compared to any other insulation material on the market, but they serve different purposes depending on your project.

Open-Cell vs Closed-Cell: Which Is Right for Your Grimsby Home?

Open-cell spray foam is lighter, more flexible, and excellent for soundproofing. At R-3.7 per inch, it fills wall cavities completely and is the go-to choice for interior partition walls, party walls in semi-detached Grimsby homes, and floors between levels where noise reduction matters. It is vapor-permeable, meaning it allows moisture to pass through — which can be an advantage in certain wall assemblies.

Closed-cell spray foam is denser, stronger, and provides both thermal insulation and a complete vapor barrier in one application. At R-6 to R-7 per inch, it delivers nearly double the R-value per inch compared to open-cell. This makes it ideal for basement walls, rim joists, crawl spaces, cathedral ceilings, and any application where space is limited or moisture resistance is critical.

For most Grimsby homes, we recommend closed-cell for basements and below-grade applications (where moisture is always a concern) and open-cell for interior soundproofing applications. During your free estimate, our crew will assess your specific situation and recommend the right product.

How Much Does Spray Foam Insulation Cost in Grimsby?

The cost of spray foam insulation in Grimsby varies depending on several factors: the type of foam (open-cell vs closed-cell), the area being insulated, the thickness required to meet code, accessibility of the space, and the total square footage. Closed-cell foam is more expensive per board foot than open-cell due to its higher density and material cost.

Rather than quoting generic price ranges that may not reflect your project, we provide free on-site estimates where we measure your space, assess the conditions, and give you an exact quote. Visit our detailed spray foam cost guide for a deeper breakdown of pricing factors across Ontario.

Common Spray Foam Applications in Grimsby Homes

The most common spray foam application in Grimsby is basement insulation. Whether you are finishing your basement into a living space or simply want to eliminate cold floors on the main level above, closed-cell spray foam applied to the foundation walls and rim joists is the gold standard. It stops moisture migration from the concrete, eliminates drafts, and provides the R-value needed to pass inspection.

Attic insulation is the second most requested service. Grimsby attics with old fiberglass batting are notorious for ice damming, heat loss, and moisture problems. Spray foam applied to the underside of the roof deck (creating a conditioned attic) or to the attic floor eliminates these issues entirely. Other common applications include crawl spaces, garages, cathedral ceilings, additions, and new construction.

We also see significant demand from Grimsby homeowners doing full gut renovations on century homes. These projects involve removing all original plaster, spraying closed-cell foam directly against the brick, and re-framing the interior — transforming a drafty, energy-wasting house into a high-performance building envelope.

Why Spray Foam Beats Traditional Fiberglass Insulation

The fundamental advantage of spray foam over fiberglass is air sealing. Fiberglass batts only slow heat transfer through conduction — they do nothing to stop air movement. In a typical Grimsby home, 30-40% of energy loss occurs through air leakage, not through the insulation itself. Spray foam stops both conduction and convection by expanding to fill every gap.

Beyond air sealing, spray foam does not absorb moisture (closed-cell acts as a vapor barrier), does not settle or compress over time, provides superior R-value per inch, reduces noise transmission, and strengthens the structural integrity of walls. It is a one-time installation that lasts the lifetime of the building with no maintenance required.